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Technical Briefs

Simulation of Droplet Position Control in Digital Microfluidic Systems

[+] Author and Article Information
Biddut Bhattacharjee

School of Engineering, University of British Columbia Okanagan, Kelowna, BC, V1V 1V7, Canadabiddut@interchange.ubc.ca

Homayoun Najjaran

School of Engineering, University of British Columbia Okanagan, Kelowna, BC, V1V 1V7, Canadahomayoun.najjaran@ubc.ca

J. Dyn. Sys., Meas., Control 132(1), 014501 (Dec 01, 2009) (3 pages) doi:10.1115/1.4000077 History: Received July 11, 2008; Revised May 28, 2009; Published December 01, 2009; Online December 01, 2009

Digital microfluidic systems (DMSs) are emerging with high potential to serve as true labs-on-a-chip (LOCs) systems for various chemical and biochemical analyses. Significant research efforts have been devoted toward the design and fabrication of improved LOC systems. Due to design, fabrication, and also runtime uncertainties, feedback control schemes must be incorporated to ensure reliability and accuracy of LOCs for practical use. This paper introduces the basics of the control analysis and design of the DMS, which is a relatively unexplored area in digital microfluidics. Based on the semi-empirical models of the droplet dynamic system, simulation results of the closed-loop position control of a droplet between two adjacent cells of a DMS are presented. The dynamic response is analyzed and discussed in relation to the operational parameters of a DMS.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Side-view of droplet motion showing the sources of resistance to motion

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Figure 2

Block diagram of the open loop droplet motion

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Figure 3

Simulink model of droplet motion

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Figure 4

Simulation results showing droplet response (position) to a step command

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Figure 5

Simulation results showing droplet response (velocity) to a step command

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Figure 6

Resistive forces as fractions of total resistance

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Figure 7

Dynamic response of a droplet for different values of the controller gain

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